Maryland Code, Labor and Employment § 9-708

(1) a partner whom a partnership elects to be a covered employee under § 9-219 of this title;

(2) a sole proprietor who elects to be a covered employee under § 9-227 of this title; or

(3) an officer of a corporation who:

(1) the employer has been notified in accordance with § 9-704 of this subtitle; or

(2) the employer or a designated representative of the employer at the place where the accidental personal injury occurred knows about the disability or death of the covered employee.